US10707782B2 - Bi-directional energy converter with multiple DC sources - Google Patents
Bi-directional energy converter with multiple DC sources Download PDFInfo
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- US10707782B2 US10707782B2 US14/725,391 US201514725391A US10707782B2 US 10707782 B2 US10707782 B2 US 10707782B2 US 201514725391 A US201514725391 A US 201514725391A US 10707782 B2 US10707782 B2 US 10707782B2
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/125—Avoiding or suppressing excessive transient voltages or currents
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
- H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
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- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/49—Combination of the output voltage waveforms of a plurality of converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
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- Y10T307/305—
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Definitions
- the present invention relates to a bi-directional stacked voltage source converter with separate DC sources and at least one AC source, and more particularly to a bi-directional stacked voltage source inverter with separate DC sources and a AC source including an exemplary apparatus and a method for use in systems with DC storage elements, which can operate in off grid and on grid operation.
- the fields of use for this unique technology are, but not limited to, renewable electricity generation with storage, electric vehicles, energy storage, UPS in data center power management and motor drives.
- U.S. Pat. No. 7,796,412 discloses an apparatus for power conversion.
- the apparatus has at least two power stages, each power stage of the at least two power stages capable of converting DC input power to DC output power; and a controller for dynamically selecting, based on a first DC power, one or more power stages of the at least two power stages for converting the first DC power to a second DC power, further comprising an output circuit coupled to the at least two power stages for converting the second DC power to AC power.
- U.S. Pat. No. 8,089,178 discloses a direct current to pulse amplitude modulated (“PAM”) current converter, denominated a “PAMCC”, which is connected to an individual source of direct current.
- the PAMCC receives direct current and provides pulse amplitude modulated current at its three output terminals, wherein the current of each terminal is one hundred twenty degrees out of phase with the other two terminals.
- the pulses are produced at a high frequency relative to the signal modulated on a sequence of pulses.
- the signal modulated onto a sequence of pulses may represent portions of a lower frequency sine wave or other lower frequency waveform, including DC.
- each phased output is connected in parallel with the outputs of similar PAMCCs an array of PAMCCs is formed, wherein each voltage phased output pulse is out of phase with respect to a corresponding current output pulse of the other PAMCCs.
- An array of PAMCCs forms a distributed three-phase multiphase inverter whose combined output is the demodulated sum of the current pulse amplitude modulated by each PAMCC on each phase.
- a method and apparatus for power conversion supports a plurality of operation options, including, but not limited to, grid storage applications, uninterruptible power supply applications, and electric vehicle power applications.
- a multiple dc sources bi-directional energy converter includes a plurality of direct current (DC) power sources; one alternating current (AC) power source; at least one stacked alternating current (AC) phase, each stacked alternating current (AC) phase having at least two or more full bridge converters, each respectively coupled to one of the direct current power sources, each full bridge converter having an inductor electrically coupled thereto; and a local controller coupled to each full bridge converter controlling the firing sequence of the switching devices in said full bridge converter to generate an approximate sinusoidal voltage waveform when operated as a voltage source inverter in one direction or generate an approximate constant direct current (DC) output when operated as a full-wave active rectifier in the opposite direction.
- DC direct current
- AC alternating current
- AC stacked alternating current
- AC stacked alternating current
- a multiple dc sources bi-directional energy converter includes a plurality of direct current (DC) power sources; one alternating current (AC) power source; at least two or more full bridge converters, each respectively coupled to one of the direct current power sources and each having a primary node and a secondary node, each full bridge converter having a positive and negative node, each full bridge converter having a voltage supporting device electrically connected in a parallel relationship between said positive node and said negative node, each full bridge converter having an inductor electrically connected between primary and said first leg of full bridge converter, and a direct current (DC) power source connected between said positive and negative nodes; at least one stacked alternating current (AC) phase, each stacked alternating current (AC) phase having a plurality of said full bridge converters, each of said full bridge converters in each stacked alternating current (AC) phase interconnected in a series relationship with said secondary node of one of said full bridge converters connected to said primary node of another full bridge converter, said series interconnection defining a first full
- a direct current (DC) voltage source inverter to supply power to an alternating current (AC) power system includes a plurality of full bridge inverters, each having a primary node and a secondary node, each of said full bridge inverters having a positive and a negative node, each of said full bridge inverters having a voltage supporting device electrically connected in a parallel relationship between said positive node and said negative node and a direct current (DC) source connected between the positive and negative nodes; at least one stacked inverter phase, each stacked inverter phase having a plurality of said full bridge inverters, each of said full bridge inverters in each stacked inverter phase interconnected in a series relationship with said secondary node of one of said full bridge inverters connected to said primary node of another full bridge inverter, said series interconnection defining a first full bridge inverter and a last full bridge inverter, each phase having an input node at said primary node of said first full bridge inverter and an output node
- the system includes generating a first error signal from comparison of an average DC voltage from a plurality of DC sources with a reference DC voltage; generating a second error signal from an average DC current with said detected and averaged AC current level; activating and deactivating a plurality of full bridge inverters based on the first and second error signals to approximate the sinusoidal voltage waveform.
- Implementations of this aspect can include one or more of the following.
- the method can include detecting the DC voltage and current levels of a plurality of DC sources and calculating power.
- the method includes averaging said DC voltage and current levels and comparing said average with a reference DC voltage and current.
- the method includes comparing said average with said detected and averaged AC current levels.
- the method includes generating a phase modulation signal from said second error signal and an AC line voltage detected period. An AC line voltage period can be detected using a phase locked loop.
- the method includes generating a plurality of firing reference signals for said full bridge inverters using said phase modulation signal.
- the method includes determining a modulation index and providing a reference table for said modulation index.
- switching devices firing signals can be calculated based on phase modulation signal using a digital signal processor (DSP).
- DSP digital signal processor
- the method includes providing communication between the basic inversion units and a system controller. The system controller controls a basic inversion unit operating range and also decides on needs of activating or deactivating of each basic inversion unit.
- the method includes interconnecting a plurality of full bridge inverters using a single conductor in series
- system controller controls a single basic inversion unit operating as a current source and plurality of basic inversion units operating as voltage sources.
- system controller controls plurality of basic inversion units operating as voltage sources.
- Three stacked inverter phases can be used and connected to form a wye (Y) or a delta ( ⁇ ) connection.
- Each basic inversion unit incorporates a switch to selectively shorten its output in the event of individual stage faults, allowing the remaining series connected basic inversion units to continue to operate.
- the full bridge inverter can be a first switching pair and a second switching pair, each of said switching pairs having a plurality of switching means for controllably regulating electrical current flow, each of said switching means having a first end and a second end, said first switching pair having a plurality of switching means electrically connected at said first end at said positive node of said full bridge inverter, said second end of one of said switching means of said first switching pair electrically connected to said primary node, said second end of another of said switching means of said first switching pair electrically connected to said secondary node, said second switching pair having a plurality of switching means electrically connected at said second ends at said negative node of said full bridge inverter, said first end of one of said switching means of said second switching pair electrically connected to said primary node, said first end of another of said switching means of said second switching pair electrically connected to said secondary node.
- the primary node can be connected to an inductor.
- the secondary node can be connected to an inductor.
- a capacitor can be connected between the primary and secondary nodes to generate a local AC voltage reference used for synchronization of the basic inversion units to the AC grid phase. Each basic inversion unit detects the line frequency when the capacitor is present.
- the capacitors also provide short term protection against reverse current flow in the event to individual device failures.
- the switching device can be a gate turn-off device and an anti-parallel device connected in parallel and oppositely biased with respect to one another.
- the gate turn-off device comprises a component selected from the group consisting of: a gate turn-off thyristor, an insulated gate bipolar transistor (IGBT), a metal-oxide-semiconductor field-effect transistor (MOSFET), a metal semiconductor field effect transistor (MESFET), a junction gate field-effect transistor (JFET), a MOSFET controlled thyristor, a bipolar junction transistor (BJT), a static induction transistor, a static induction thyristor and a MOSFET turn-off thyristor, a gallium nitride (GaN) transistor, a silicon carbon (SiC) transistor.
- the antiparallel device can be a diode.
- Each full bridge inverter can be connected to capacitors, batteries, fuel cells, photovoltaic cells, photovoltaic modules or biomass cells.
- a buck or boost voltage regulation circuit can be placed between the DC power source and the full bridge inverter within the basic inversion unit.
- An active filter can decouple AC voltage modulation imposed on the DC voltage within each basic inversion unit when used with DC sources including photovoltaic cells.
- a variable number of basic inversion units can be used in a phase to match a specific grid voltage. Each basic inversion unit can operate at different DC power levels. A variable number of basic inversion units can be used for each phase.
- a method for inverting a plurality of direct current (DC) sources to approximate a sinusoidal voltage waveform includes detecting grid AC voltage level where a stacked phase will be connected to an AC grid network; calculating AC start up voltage for stacked basic inversion units by a system controller; calculating power, implementing maximum power point tracking algorithm, and generate a reference DC voltage; averaging said input DC voltage levels; comparing said average DC voltage levels with a reference DC voltage; generating a first error signal from said comparison of said average with a reference DC voltage; comparing an average DC current from the DC voltage sources with detected AC current levels; generating a second error signal from said comparison of said average with said detected AC current levels; generating a phase modulation signal from said second error signal; detecting an AC line voltage having a period; generating a phase reference signal directly related to said period of said AC line voltage; generating a plurality of firing reference signals for a full bridge inverter using said phase reference signal; determining a modulation index; and providing a reference table for
- the output shorting means e.g. relay, solid state switch, or other
- Each basic inversion unit can have the shorting means to prevent the possibility where the system could not operate if one of the series connected units fails or does not have enough DC input power to operate.
- the control of the shorting means could come from either a) the local controller, or b) from the system controller.
- the system controller can close at least one parallel switch with a current limiting device that will serve as a phase reference signal said AC line voltage for synchronization of each basic inversion unit prior to the start of power generation by the stacked basic inversion units.
- a method for inverting a plurality of DC sources to approximate a sinusoidal voltage waveform includes sensing an average DC voltage from a plurality of DC sources; activating and deactivating a plurality of full bridge inverters based on the sensed DC voltage. Implementations can include one or more of the following.
- the method includes providing communication means between the basic inversion units and a system controller.
- the method includes detecting the AC voltage level and creating first voltage reference signal if voltage is outside a range calculated by the system controller.
- the method includes detecting the AC voltage levels and creating first current reference signal if voltage is inside the range calculated by the system controller.
- the method includes averaging said AC voltage levels and comparing said average with a reference DC voltage.
- the method includes averaging said AC current levels and comparing said average with a reference DC current.
- the method includes generating a phase shift signal from said user command signal.
- the method includes detecting an AC line voltage having a period and generating a phase reference signal directly related to said period of said AC line voltage.
- the method includes generating a plurality of firing signals for a plurality of full bridge inverters using said phase reference signal and said phase shift signal.
- the method includes determining a modulation index and providing a reference table for said modulation index.
- the method includes determining firing signals by comparing phase reference signal to up-down digital counters.
- the system provides a new and improved stacked voltage source inverter and more specifically a stacked voltage source inverter for connecting to a high voltage, high power AC system.
- the system provides a wye or delta configured stacked voltage source inverter interface to the grid.
- the system requires only 2 cables for each inverter.
- the system is highly efficient, yet scalable.
- the system can be configured for single or three phase operation.
- the system is highly reliable, small form factor, and very light weight.
- the system is flexible, supporting multiple grid voltages and frequencies with a single basic inversion unit device configuration.
- FIG. 1 shows an exemplary power control system for grid storage applications.
- FIG. 2 shows an exemplary power control system for data center applications.
- FIG. 3 shows an exemplary power control system for electric vehicle applications.
- FIG. 4 shows an exemplary power control system for on-grid control discharge applications.
- FIG. 5 shows an exemplary power control system for on-grid control charge applications.
- FIG. 6 shows an exemplary process by a local controller for a discharge mode.
- FIG. 7 shows an exemplary process by the local controller for a charge mode.
- FIG. 8 shows an exemplary phase-locked-loop used by the local controller.
- FIG. 9 shows an exemplary process by a system controller for a discharge mode.
- FIG. 10 shows an exemplary process by the system controller for a battery charge mode.
- FIG. 11 shows an exemplary process by a local controller of a master BIU for off-grid control.
- FIG. 12 shows an exemplary process by a local controller of a slave BIU for off-grid control.
- FIG. 13 shows an exemplary process by a system controller for off-grid control.
- the unique topology, control and processing in the system enables usage in applications such as, but not limited to, grid storage ( FIG. 1 ), data center ( FIG. 2 ), and electric vehicles ( FIG. 3 ). All three applications have fairly similar needs as far as charging of standard battery cells and discharging those same cells. In these cases, using several small battery cells aggregates the power. In some cases, manufacturers and system designers use thousands in a single cluster to make up larger energy storage capacity.
- the benefits of applying this unique inversion/conversion technology on a per cell basis are high reliability, high efficiency, low cost, low weight, small size and bi-directional advantages.
- the bi-directional and per cell charge balanced inversion and conversion results in battery life extension, ancillary service offerings and reduction in fire hazard.
- FIG. 1 an exemplary power control system for grid storage applications is shown.
- FIG. 1 has a plurality of energy storage devices (such as batteries, among others) 522 providing power to basic inversion units 520 .
- the basic inversion unit can be comprised of a local controller and full bridge inverter with an LC output filter and in one embodiment a DC/DC converter circuit if a different DC voltage bus is required to support the system design.
- This DC/DC converter can be a boost (to increase the DC bus voltage from the DC source voltage) or buck (to decrease the voltage from the DC bus to the DC source voltage)
- the basic inversion unit can also be comprised of a local controller and full bridge inverter with an LC output filter and in one embodiment a bidirectional isolated DC/DC converter providing galvanic isolation between DC source and AC source.
- the basic inversion units 520 are connected in series, with the output of each basic inversion unit 520 controlled by a local controller.
- the output of the series connected basic inversion units 520 is initially connected to a resistor 526 in series with switch K 1 528 and the grid 534 . This signal is used by BIUs to determine and lock to the grid frequency. Once the BIUs are synchronized and started the switch K 2 530 will close and connect the stacked BIUs to the grid 534 .
- Switches 528 and 530 could either be solid state switches or relays. Switches 528 - 530 are controlled by a system controller to provide system soft start (no overcurrent).
- the system controller can update the amount of power produced by particular BIUs to provide DC source balancing (such as battery) if necessary.
- the system can handle a variable number of series connected basic inversion units, where the minimum and maximum number of basic inversion units per system is determined by the aggregate grid voltage across all the series connected full bridge inverters and the maximum and minimum AC output voltage rating of each basic inversion unit.
- Each basic inversion unit can operate as voltage source in order to realize effective basic inversion unit stacking.
- the system controller communicates with the basic inversion units over a communication channel.
- the communication channel can be wired such as the power-line communication channel or can be wireless such as Zigbee transceivers, or can use separate wire among others.
- the system controller also implements algorithms detecting abnormal grid conditions and methods of shutting down and disconnecting the stacked basic inversion unit system from the grid by controlling switches K 1 and K 2 .
- system controller can configure one basic inversion unit as a current source, and the remaining basic inversion units can be used as voltage sources.
- Three separate series connected groups of basic inversion units can be configured as a 3-phase inversion system in one embodiment.
- FIG. 2 shows an exemplary power control system for data center applications.
- the system acts as an uninterruptible power supply (UPS) system.
- UPS uninterruptible power supply
- K 3 530 will disconnect the load 540 from the power grid and connect it to the UPS system. This function could be performed by the system controller 524 .
- the system controller will start the UPS system by closing K 1 , starting BIUs without current overshoot.
- FIG. 2 has a plurality of energy storage devices (such as batteries, among others) 522 providing DC power to the basic inversion units 520 .
- the basic inversion units 520 are connected in series, with the output of each basic inversion unit 520 controlled by a local controller.
- the output of the series connected basic inversion units 520 is also connected to a resistor 526 in series with optional switch K 1 528 .
- Optional switch K 1 provides a path with limited current to pre-charge capacitors in the BIUs.
- the system controller will connect switch K 2 532 .
- Switch 530 provides connection to the grid 534 or an information technology load 540 . In one position, switch 530 connects the IT load 540 to the grid 534 and in a second position switch 530 connects the load 540 to the UPS.
- Switches 528 - 532 could either be solid state switches or relays. Switches 528 - 532 are controlled by the system controller.
- the system can handle a variable number of series connected basic inversion units, where the minimum and maximum number of basic inversion units per system is determined by the aggregate grid voltage across all the series connected full bridge inverters and the maximum and minimum AC output voltage rating of each basic inversion unit.
- One BIU is configured as current source. Other BIUs will use this current to lock their frequency.
- Other basic inversion units operate as voltage sources in order to realize effective basic inversion unit stacking.
- K 1 switch can be connected directly to IT load to allow UPS to operate in idling mode. Once the grid fails the system controller needs to open K 3 and close K 2 . Since this transitions can happen very fast will be no interruption in power to the IT load.
- FIG. 3 is a corresponding diagram for a stacked inverter in an electric vehicle drive application. Similar to FIG. 1 , FIG. 2 has a plurality of energy storage devices (such as batteries, among others) 522 providing power to basic inversion units 520 .
- switch K 3 535 will connect the motor load to bi-directional converter system. To recharge batteries switch K 3 535 will be connected to grid position or regenerative braking source and charge the batteries. This function could be performed by the system controller 524 .
- switch K 1 provides a path with limited current to pre-charge capacitors in the BIUs. Once the BIUs are started, the system controller will connect switch K 2 530 . Switch 530 is controlled by solenoid 532 .
- switches 528 or 530 are provided to switch 535 controlled by solenoid 536 . In one position, switch 535 connects to the grid 534 and in a second position switch 535 connects to motor 538 .
- the switches could either be solid state switches or relays and controlled by the system controller.
- a communication channel 540 is provided between the system controller 524 and the basic inversion units 520 .
- the communication channel 540 can be wired, wireless, or over the power-line, among others.
- FIG. 4 shows an exemplary power control system for on-grid discharge applications.
- An energy storage device such as a battery
- 530 provides direct current (DC) output to a full bridge inverter 532 .
- the output of the full bridge inverter 532 is provided to a low pass filer 534 which can be an inductor-capacitor (LC) type filter in one embodiment.
- the output of the filter 534 is provided to an AC power grid or AC power bus.
- the output of the filter 534 is monitored by the local controller 550 .
- the system controller 540 monitors output voltage and current of a phase with the stacked basic inversion units.
- the system controller sends commands to a communication module 568 to set parameters of a limiter 558 to adjust the voltage and current generated by the inverter 532 .
- the voltage and current from the energy storage device 530 is monitored by a multiplier 551 whose output is received by an adder or summer 554 that drives a power controller 556 , which can be a proportional integral controller in one embodiment.
- a reference current value is the output of the power controller.
- the controller 556 output is connected to the limiter 558 to generate an output m, modulation index.
- a multiplier 560 receives the output of the limiter 558 and a phase lock loop (PLL) 570 to generate an output m sin ⁇ .
- the limiter 558 and PLL 570 monitor the grid output as supplied through the low pass filter 534 .
- the output of the multiplier 560 is supplied to a driver 566 such as a pulse width modulation (PWM) driver that drives the full bridge inverter 532 .
- PWM pulse width modulation
- FIG. 5 shows an exemplary power control system for on-grid control charge applications. This system is similar to the system of FIG. 4 , with the addition of a battery power and voltage signal from the multiplier 551 to the limiter 558 . In this mode the energy has been pulled from the grid to charge the battery.
- FIG. 6 shows an exemplary process by a local controller for a discharge mode.
- the maximum and minimum voltage values are received from system controller ( 610 ).
- the system samples inverter output voltage Vom and current Iom ( 612 ).
- the process determines if Vom>Vommax ( 620 ). If yes, reference output voltage Voref is set to Vommax and ⁇ is set to Voref ⁇ Vom ( 622 ) and voltage control limiting loop is running. The process then sets m as k1* ⁇ +k2* ⁇ /s ( 624 ). If no, the regular current loop is run having Ioref set to Iref and ⁇ is set as Iref ⁇ Iom ( 626 ). Next, m is set to be k3* ⁇ +k4* ⁇ /s ( 628 ).
- FIG. 7 shows an exemplary process by the local controller for a charge mode.
- the maximum and minimum voltage values are received from system controller ( 610 ).
- the system samples inverter output voltage Vom and current Iom ( 612 ).
- the process determines if Vom>Vommax ( 620 ). If yes, Voref is set to Vommax and ⁇ is set to Voref ⁇ Vom ( 622 ) and voltage control limiting loop is run. The process then sets m as k1* ⁇ +k2* ⁇ /s ( 624 ). From 620 , if no, the system checks if Vom>Vbmax ( 630 ) and if not, the regular current loop is run having Ioref set to Iref and ⁇ is set as Iref ⁇ Iom ( 626 ). Next, m is set to be k3* ⁇ +k4* ⁇ /s ( 628 ). From 630 , if Vom>Vbmax, Voref is set to Vbmax and ⁇ is set to Voref-Vom ( 632 ) and m is set to k1* ⁇ +k2* ⁇ /s ( 636 ).
- FIG. 8 shows an exemplary phase-locked-loop used by the local controller.
- a single-phase voltage (V ⁇ ) and an internally generated signal (V ⁇ ) are used as inputs to a Park transformation block ( ⁇ dq).
- the d-axis output of the Park transformation is used in a control loop to obtain phase and frequency information of the input signal.
- V ⁇ is obtained through the use of an inverse Park transformation, where the inputs are the d and q-axis outputs of the Park transformation (dq ⁇ ) fed through first-order pole blocks.
- the poles are used to introduce an energy storage element in the internal feedback loops.
- the PLL algoritham can be run in system controller and syncronisations signal can be provided to local controle by various communication means.
- FIG. 9 shows an exemplary process by a system controller for a discharge mode.
- the process determines if the stacked inverter phase voltage, Vgs, is greater than or equal to grid voltage, Vgm ( 666 ) and if not, the process waits until the desired voltage is reached. Once this is achieved, the process closes relay or switch K 2 ( 668 ). This is normal operating mode where power from n BIUs is being delivered to the AC grid. Next, the process monitors delivered power to the grid, Ps If the power Ps is greater than or equal to the minimum operating power Pmin ( 670 ), the process loops back to 670 to continue providing power. If not, the process opens relays K 1 and K 2 and performs system shutdown ( 672 ).
- FIG. 10 shows an exemplary process by the system controller for a battery charge mode.
- the process closes relay or switch K 2 ( 669 ). From 669 , the process checks if charging current needs adjustment ( 671 ) and if so, changes the reference current Iref for a particular BIU ( 672 ). From 671 or 672 , the process checks if charging power Pch is greater or equal to Pmin ( 677 ) and if not, opens K 1 and K 2 and performs system shutdown ( 678 ) as charging is done.
- FIG. 11 shows an exemplary process by a main or system controller for off-grid control.
- the system sets an input reference voltage Vmref as Vg/n, where n is the number of series connected basic inversion units ( 710 ).
- the process runs a current loop ( 716 ) and generates modulation signal based on the loop output and frequency information received from system controller.
- FIG. 12 shows an exemplary process by a local controller of BIU for off-grid control.
- the system sets an input reference voltage Vmref as Vg/n, where n is the number of series connected basic inversion units ( 740 ).
- the process runs a PLL, locks to the AC frequency, runs a current loop ( 742 ) and generates modulation signal based on PLL output and the loop output.
- FIG. 13 shows an exemplary process by a system controller for off-grid control.
- the system sets an input reference voltage Vmref as Vgref/n, where n is the number of series connected basic inversion units ( 760 ), Vgref is grid reference voltage and defines an output frequency.
- Vgref is grid reference voltage and defines an output frequency.
- the process sends the reference voltage information and output frequency to the basic inversion units ( 762 ).
- the process determines if Vg is equal to Vgref ( 764 ). If not, the system checks each basic inversion unit to see if the maximum power is achieved ( 766 ). If no basic inversion unit is below maximum power, the process checks the output voltage against a low voltage limit ( 768 ).
- the process increases the target voltage Vm′ to these basic inversion units ( 770 ). From 764 , if Vg is equal to Vgref, the process notifies the system that the set point voltage has been achieved ( 772 ).
- the system controller defines output frequency and operating voltage for each basic inversion unit.
- the system controller assigns a master function to one basic inversion unit, and the system controller assigns slave function to all other stacked basic inversion units.
- the master starts first and provides AC power serving as a reference frequency to slave basic inversion units.
- Each slave locks to the reference frequency using a PLL and start generating its own AC power.
- the system controller monitors power production and adjusts basic inversion unit operation as necessary.
- the basic inversion units are series connected using a single conductor cable and connectors.
- the use of only single conductor cables and connectors reduces material costs.
- Each basic inversion unit provides an output AC power to a series connected AC bus.
- the AC bus terminates into a system controller.
- the system controller generally connects together the outputs from all the basic inversion units to form a single AC feed.
- the system includes aBIUs with two standard cables and connectors.
- Each basic inversion unit provides an output AC power to a series connected AC bus.
- the AC bus terminates into a system controller box.
- the system controller generally connects together the outputs from all the basic inversion units to form a single AC feed to an electric panel.
- a bank of batteries can supply power to a plurality of series connected basic inversion units through the system controller to the power grid and, in some applications, to appliances within a user's facility.
- the electric panel is a well-known AC distribution hub having various circuit breakers and/or fuses to distribute electricity to various circuits within the home.
- the electric panel is coupled through the electric meter to the power grid. The meter determines the amount of power supplied to the grid, such that the owner of the PV panel can be compensated for supplying electricity.
- the basic inversion units convert DC to AC in accordance with the control and switching signals produced by the local controller.
- the controller produces the control and switching signals in response to the samples of the DC and AC signals. Consequently, the basic inversion units may be optimally controlled to utilize a particular mode of operation to correspond to the present state of the DC and AC signals, i.e., to balance charge of the DC source to provide longer system operation and extend life time for dc storage elements.
- a DC energy source provides input power to the AC bridge.
- a decoupling capacitor filters switching ripple from the AC bridge as well as lower frequency ripple from the AC grid.
- the AC bridge can be a PWM controlled half bridge or full bridge inverter which output terminals are connected to a AC filter.
- the AC filter can be a low pass filter that filters out the high frequency PWM harmonic noise.
- the output circuit implements a sensing circuit for synchronization to the AC grid frequency and a disconnect relay.
- a DC conversion stage may be required to adjust dc bus voltage for optimal performance.
- a boost circuit would be, for example, used to increase the operating voltage across the DC link capacitor thereby allowing for a larger peak to peak AC operating voltage across the AC input and output terminals.
- a larger peak to peak AC operating voltage allows for fewer single level inverters to be used to generate a required stacked phase AC output voltage.
- a buck circuit would be used to reduce the operating voltage across the DC link capacitor. This would enable use of lower voltage rating transistors in the AC bridge thereby increasing amount of power that one stacked phase can produce and in turn reduce system cost.
- DC energy is supplied by a DC electric source, which can store energy such as a battery, generator capacitor, or a flying wheel, among others.
- the output of the DC electric source is provided to a DC stage, whose output is smoothed by a filter and provided to a bridge circuit.
- the output of the bridge circuit is provided to a filter, and the resulting output stage is connected in series to the output of other basic inversion units using suitable cables.
Abstract
Description
Claims (19)
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KR102048603B1 (en) | 2019-11-25 |
TW201351868A (en) | 2013-12-16 |
CN104428988A (en) | 2015-03-18 |
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US9099938B2 (en) | 2015-08-04 |
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US20130155736A1 (en) | 2013-06-20 |
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WO2013151907A2 (en) | 2013-10-10 |
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US20150357940A1 (en) | 2015-12-10 |
EP2834912A4 (en) | 2016-04-06 |
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